Good morning all.After some hours perfect function with new update to 8.0 , sim stopped to work.I'd go to the local dealer and him change my sim with a sostitute, wait all the night and nothing net on the BV8000 Pro.Test the sim on other phone and it work well.Go to buy another sim from a different operator, and nothing to do.This morning downgrade to BV8000Pro_blackview_20180308 (7.0)and all go right , two sim on my phone and all it's ok.Not a good experience.I'm from Italy